In the words you use. In the way you say them. In your intonations and facial expressions. In your gestures. In your actions. In how you carry yourself and how you interact with others.
The lack of humility shows too, even when you try to hide it. It can't be faked.
Humility earns you respect and support from others. It tells you what you need to work on to become better. And it lets you accept failures, learn, bounce back, and adapt.
Lack of it—arrogance—drives people away and becomes a self-imposed barrier to success.